Booming demand along with the grounding of Boeing's 737 Max aircraft is biting into Northern Hemisphere spring and summer schedules. United Airlines said on Monday it would remove its 14 MAX jets through early July. All on board both planes were killed. Planes run fullest during June, July and August, when airlines earn the most revenue per available seat mile, according to U.S. Bureau of Transportation Statistics.

"By extending our cancellations through the summer, we can plan more reliably for the peak travel season and provide confidence to our customers and team members when it comes to their travel plans", Parker and Isom wrote.

American cancelled 350 flights out of Dallas-Fort Worth on Saturday, but that had nothing to do with the MAX, said spokesman Ross Feinsten.

Currently, Boeing has pilots from American Airlines testing a software update to the MCAS system in the simulator at the Boeing facility in Renton, Washington.

"We've used spare aircraft and other creative solutions to help our customers, who had been scheduled to travel on one of our 14 MAX aircraft, get where they are going".

The announcement made American the second major carrier to cancel flights using the plane through the busy summer season in the northern hemisphere.

How has the grounding of the 737 MAX affected Southwest's operation?

A Boeing executive, speaking on the condition of anonymity because he was not authorized to discuss the issue publicly, said late last month that the training component of that update had been "provisionally approved" by regulators.

As a result, Boeing's storage lots are packed with undelivered 737 Max aircraft.

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